Do you know what type citrus it is? How big was it when you bought the house; and how big is it now? Have you fertilized it; should be fed at least 3 times per year.
Depending on the variety and the rootstock some citrus might not produce fruit for maybe 7 years. If you can provide a little more specific information and maybe post a picture or two, there are lots of experienced people here who can help you.

It was about 3-4 feet I don't know what time of citrus but neighbor said its mandarin . Yes I have fertilized the tree ever since Feb 2010 I also used spike but still no fruit.

Here is a pic of tree
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I guess theres a chance it could be a seedling tree, which means it will go through a long juvenile phase where it will not fruit. Thats not very common but occassionally a homeowner will sprout a citrus from seed. I can't really tell but it looks like there might be a bud union at the base of the tree, if so it is not a seedling tree.

Other than at, it looks pretty shady in that spot. It should be in full sun. Has it ever produced flowers?

It gets full sun I was taking picture sun was taking picture the lens had shade. It has never flowered. The tree was bought what my neighbor said.

Could be a pixie mandarin; pretty slow growing and may need up to 5 years to produce fruit. The tree looks healthy; so I would think it is just a matter of patience.

I should put my Axe near the tree to scare it..

The axe is not a bad idea; but I doubt it will help much.
I would paint the trunk up to the first branch; while the tree is small and there is so much trunk exposed to the sun, there is always a danger of sunburn of the trunk, which could kill the tree. Use the cheapest white latex paint you can get; and dilute it 1 to 1 with water.

I will have to try that Thanks